Bicycle exerciser



FIG. 1 is a perspective view of a bicycle exerciser showing my new design:

FIG. 2 is a front side elevational view thereof;

FIG. 3 is a rear side elevational view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thererof. 

The ornamental design for a bicycle exerciser, as shown. 